It would be the last Father's Day of Armando Casillas' life.
Casillas, who was 38 and had a teenage son, was at his parents' house in Sylmar late that Sunday night when he got into an altercation with a young man, according to prosecutors.
That young man called his father, Francisco Gamez II, who drove up shortly after 11 p.m. and confronted Casillas, Los Angeles police said.
"He put a light in his eyes and he said, `L.A. County sheriff. Where are you from?' But they had words, and he shot my brother," said Casillas' brother Hector, who was not there but has heard accounts from people who were.
That was June 17.
Just after noon on Wednesday, nearly five months after the shooting, Gamez was arrested on suspicion of murder and held on $4 million bail.
He was formally charged Thursday with murder, attempted murder and firing from an occupied vehicle.
Gamez, a 17-year veteran sheriff's deputy who was off-duty the night of the shooting, appeared briefly in court Thursday, but his lawyer asked for more time to review the case and the date of his entering a plea was postponed to Dec. 12. He has been on paid leave since July 3 when the investigation began focusing on him.
Hector Casillas said the family has unanswered questions about what happened that night.
Police and prosecutors revealed few details Thursday of what led to the shooting or why the investigation took months.
An LAPD press release suggested Gamez drove away after firing the fatal shot instead of waiting for police to arrive.
Hector Casillas said he didn't know what the argument was about, but called the shooting "a cowardly act."
Detective Maria Perez of the LAPD's Robbery-Homicide Division would not elaborate on the argument, but said police believe Gamez did not know Armando Casillas before that night. She would not say whether Gamez used his Sheriff's Department service weapon in the shooting.
Outside the San Fernando house listed as Gamez's home, a woman who identified herself as his sister said he is "a really upstanding guy."
The sister, who would not give her name, said she didn't know what happened on June 17. But she said Gamez, who grew up in San Fernando, has done "so much for the community," including 5K runs for various causes. And she said she hopes people will hear both sides of the story.
Armando Casillas, who was the youngest of five boys and had a baby sister, was remembered as handy and always willing to help out. He was the guy to call if your car broke down or you needed your brakes changed, Hector Casillas said.
"No one in this world's perfect, but my brother, he was a good man," he said.
Hector Casillas said the five-month wait for charges left the family frustrated, wondering whether police would cover for a fellow law enforcement officer.
"We just felt really, really kind of let down," he said.
By August, when Hector Casillas first spoke to a Daily News reporter, he already knew Gamez's name.
Police and prosecutors who met with the family were very professional, he said, but provided little information and would not confirm what the Casillases strongly suspected: that Gamez was the suspect.
Hector Casillas admitted yelling in frustration at prosecutors who came to the family home.
And speaking of his brother's funeral, he said, "I could not cry. I was angry."
But he said this week's arrest provided some closure and left the family "so, so grateful" to police and prosecutors.
It also gave the family, whose roots are in Mexico, renewed faith in their adopted country. Hector Casillas said they were pleased to be reminded that in the United States, even an officer of the law is held accountable for his actions.
"It felt very good to be an American citizen," he said.
Staff Writer Christina Villacorte contributed to this report.